/Engine/Plugins/FX/Niagara/Source/NiagaraShader/Public/NiagaraShaderParticleID.h
void NiagaraInitGPUFreeIDList ( [FRHICommandList](API\Runtime\RHI\FRHICommandList) & RHICmdList, [ERHIFeatureLevel::Type](API\Runtime\RHI\ERHIFeatureLevel__Type) FeatureLevel, [FRHIUnorderedAccessView](API\Runtime\RHI\FRHIUnorderedAccessView) * NewBufferUAV, uint32 NewBufferNumElements, [FRHIShaderResourceView](API\Runtime\RHI\FRHIShaderResourceView) * ExistingBufferSRV, uint32 ExistingBufferNumElements )